<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>设置旋转中心点</title>
    <style>
        div {
            width: 200px;
            height: 200px;
            background-color: pink;
            margin: 100px auto;
            transition: all 1s;
            /* 1可以跟方位名词 */
            /* transform-origin: left bottom; */
            /* 2默认的是50% 50% 等价于center center */
            /* 3可以是px像素 空格隔开 */
            transform-origin: 50px 50px;
        }
        div:hover {
            transform: rotate(360deg
            );
        }
    </style>
</head>
<body>
    <div></div>
</body>
</html>